I have alot of sunex, never had a problem yet. They are by no means "snap-on" probably not even "craftsman". They are cheap and seem to work good.
I definitely agree as far as impact sockets. Neither of those companies come close for the standard garden variety impacts. Well the SO has certain advantages, some are a slightly lower profile, their stampings are by far the best of any I have used (sunex, cman, bluepoint, williams, wright, snap on) The finishes from the US are definitely lacking in adequate protection, and quite a few of the so's have slight damage to the drive ends. The cman impact socket just magically appeared in the box, no clue how, it's finish is also lacking in the rust protection department.
I did wire brush a sunex socket to try to remove the coating for durability testing. Didn't really phase it in the bench grinder/wire brush.
No have broken or shown significant wear in a heavy truck shop. After looking at the cman impact that magically appeared, I could definitely not justify 77% increased cost for what seems to be slightly inferior product. The one plus I will give cman is the laser etching did outlast the joke black coating it came with. The so I have were new "freebies" part of a set.
No comment on wrenches, the USA probably still has quite a superior product.